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Chow-wow is not a real English word, but it is a portmanteau based on the words pow-wow and chow. UrbanDictionary says chow-wow is:

A meeting of the minds, business or casual, where food is served

A pow-wow is a "meeting or conference", and chow is an informal word for "food". So a chow-wow is a meeting at which there is food. This makes sense in your context--the speaker is talking about being invited over to taste someone's food, so it is a literal meeting at which eating is a big part.